IM 915-13 • VISION - EXTENDED SIZES 24 www.DaikinApplied.com
Operation Guidelines
Rotating fan. Can cause severe injury or death. Before
servicing fans, lockout and tag out power.
. Can cause property damage,
personal injury or death. Wire fan power supply and ground
motor frame in accordance with local electric codes.
Fan motor requires overload protection. Failure to provide
motor overload protection can result in re, property damage,
electric shock, person injury, or death. Connect motor to an
overload protective device rated in compliance with local
electric codes.
Do not overheat fan motor. High air temperatures in the fan
section can cause the fan motor to burnout. On draw-through
air handlers or air handlers with the fan section down the air
stream from the heating section, the discharge air temperature
of the heating section must not exceed 104°F (40°C)
Equipment damage to loose fasteners represents improper
start-up and equipment abuse. It is not covered by the
warranty.
When performing startup and service, always follow safety
precautions. Only trained, experienced personnel should
perform these functions.
Before entering fan section, make sure that fan electrical power
source is disconnected and locked in the OFF position.
1. Check that the unit is completely and properly installed
with ductwork connected.
2. Check that construction debris is removed/lters are
clean.
3. Check that all electrical work is complete and properly
terminated.
4. Check that all electrical connections are tight and that
the proper voltage is connected. Phase imbalance must
not exceed 2%.
5. Do not grease ball bearings on the fan shaft and motor
before startup. They are pre-lubricated.
6. Check tightness of setscrews in bearings and fan
wheel(s). If retightening is needed, position the fan
wheel(s) per Table 5 on page 25 through Table 10 on
page 27. Torque set screws per Table 11 and Table 12
on page 27.
7. Check alignment of fan and motor sheaves and belt
tension. Adjust if necessary. Check tightness of sheave
setscrews and/or capscrews. See Figure 66.
8. Leak test the thermal system to verify connections are
tight.
9. Check that the condensate drain is trapped.
10. Rotate the shaft by hand to be sure it is free.
11. If multiple fans are supplied with a block o plate and it is
installed on one of the fans, make sure to only start the
fans without the block o plate. Do not start any fan that
has the block o plate installed on it.
12. If multiple fans are supplied with isolation dampers, make
sure the isolation dampers are fully open before starting
the fans.
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